Improvement in iron bridges



E. 1. FARNSWUR TH.

- Iron-Bridge.

Patented Jan. 26, 18 75.

UNITED STATES PATENT Darren EDWIN I. FARNSWORTH, OF LEAVENWORTH, KANSAS.

IMPROVEMENT IN IRON BRIDGES.

Specification forming part of Letters Patent No. 159,084, dated January26, 1875; application filed January 4, 1875.

To all whom it may cancer-n:

Be it known that I, EDWIN I. FARNSWORTII, of Leavenworth, in the countyof Leavenworth and State of Kansas, have invented a new and usefulImprovement in Bridges, of which the following is a specification:

My invention consists of an improved construction of girder or arch forrailroad and other bridges, of two vertical (edgewise) channel orI-beams, with a flat plate riveted on top, transverse plates under sideat the posts and feet of the arch, and diagonal or lattice bracingintermediate to the transverse plates, which afi'ords greater strengthfor resisting the crushing efl'ect on the feet of the arch where thegreatest strain exists, and also greater lateral strength along thearch, which is very essential in this form of truss. It also enables theinside of the arch to be painted.

Figure 1 is a side elevation of an arch constructed according to myinvention, some parts being sectioned. Fig. 2 is a plan of the underside of the arch, and Fig. 3 is a transverse section on line as w ofFig. 1.

mediate to the transverse plates, all as clearly represented in thedrawings.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination, in an arch for bridges, of channel or I-beams A, topplate B, trans verse plates 0, and diagonal intermediate braces l),substantially as specified.

EDWIN I. FARNSWORTH.

Witnesses TIFFIN SINKs, CHAS. MONROE.

